Split KernelToElementMap into sub-interfaces

pkg/compiler/lib/src/kernel/kernel_backend_strategy.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.kernel.backend_strategy;
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../backend_strategy.dart';
 import '../closure.dart';
@@ skipping 22 matching lines @@
 import '../universe/selector.dart';
 import '../universe/world_builder.dart';
 import '../universe/world_impact.dart';
 import '../world.dart';
 import 'closure.dart';
 import 'element_map_impl.dart';
 import 'kernel_strategy.dart';
 
 /// A backend strategy based on Kernel IR nodes.
 abstract class KernelBackendStrategy implements BackendStrategy {
-  KernelToElementMap get elementMap;
+  KernelToElementMapForBuilding get elementMap;
   GlobalLocalsMap get globalLocalsMapForTesting;
 }
 
 /// Backend strategy that uses the kernel elements as the backend model.
 // TODO(redemption): Replace this with a strategy based on the J-element
 // model.
 class KernelBackendStrategyImpl implements KernelBackendStrategy {
   final Compiler _compiler;
   Sorter _sorter;
   ClosureConversionTask _closureDataLookup;
   final GlobalLocalsMap _globalLocalsMap = new GlobalLocalsMap();
 
   KernelBackendStrategyImpl(this._compiler);
 
-  KernelToElementMap get elementMap {
+  KernelToElementMapForBuilding get elementMap {
     KernelFrontEndStrategy frontendStrategy = _compiler.frontendStrategy;
     return frontendStrategy.elementMap;
   }
 
   GlobalLocalsMap get globalLocalsMapForTesting => _globalLocalsMap;
 
   @override
   ClosedWorldRefiner createClosedWorldRefiner(
       covariant KernelClosedWorld closedWorld) {
     return closedWorld;
@@ skipping 77 matching lines @@
   @override
   WorldImpact run() {
     return _backend.codegen(this, _closedWorld);
   }
 }
 
 /// Task for building SSA from kernel IR loaded from .dill.
 class KernelSsaBuilder implements SsaBuilder {
   final CompilerTask task;
   final Compiler _compiler;
-  final KernelToElementMap _elementMap;
+  final KernelToElementMapForBuilding _elementMap;
   final GlobalLocalsMap _globalLocalsMap;
 
   KernelSsaBuilder(
       this.task, this._compiler, this._elementMap, this._globalLocalsMap);
 
   @override
   HGraph build(CodegenWorkItem work, ClosedWorld closedWorld) {
     KernelToLocalsMap localsMap = _globalLocalsMap.getLocalsMap(work.element);
     KernelSsaGraphBuilder builder = new KernelSsaGraphBuilder(
         work.element,
@@ skipping 401 matching lines @@
   Iterable<ClassEntity> sortClasses(Iterable<ClassEntity> classes) {
     return classes.toList()
       ..sort((ClassEntity a, ClassEntity b) {
         int r = _compareLibraries(a.library, b.library);
         if (r != 0) return r;
         return _compareNodes(
             a, elementMap.getClassNode(a), b, elementMap.getClassNode(b));
       });
   }
 }